Chain-grate furnace.



L. H. MXPIELD.

CHAIN GRATE PUBNAB.

APPLIGATloN FILED DEO. 24, 190s.

nele. me TLY@ Patented Jan. 18, 1910.

L. H. MAXPIBLD.

CHAIN GRATE PURNAGE.

APPLICATION FILED DBG. 24, 1908.

gsygo Patented Jan. 18, 1910.

3 SHEETS-SHEET 2.

L. H. MAXFIBLD.

CHAINl GRATE PURNAGE.

APPLICATION FILED DEO.24,1908, 945)?52, Patented Jan. 18, 1910.

" 1 omc-E.

- the drawing being.;tof-anincreased.seule;-

' f Beit lino\vivtliat I, Lener ll'..'^;lI.ix riELo1 --K Fig. -3 is a perspective view 'of aliaie shoe' a citizenvof.theUiiite l{St:ites, residing at a employedfnt the inneriehdm theffurnncer Godfrey, in thecounty offM-adison and State Fig. lLis-a 'transverse section of-fthefn'rnncei of.Ill1nois,lha\e invented :1 ce1- tain new and xn rounding the inner end: ofthegrnte', the

. 'admita great denl of air at this pointv whichl forni 131 eSll Dit 14 and SideSYilllS 15- up n, asit'nere, ini-bending the supporting amount of eoa'l to naces, ofwhieh'tle `following isaspecifiea# of'this 'figure are in end elevation instead of l t1on.1'- 'A i My invention relates to chain 4grnte furl iinces'vnjhereinlhegrate Consists fof .a Set It'ivill behnderstoodtliat'in chaingrntes thec'oalis fed froma Suitable chute locutedi neartheforward-endoi the furnace. As fthe topgo'fthe". grate-:moves inward, the coal' is4 raduallyheated, then consumed and lin-ally,

ashes are' dumped on'.

` be' depsitedl-uponjhe x rearbridge, Wall 12, iloororffplat'f..

. These;

greatlv retards conilnlstion, for not only is l p arts present no special-novel@ in cons'truc'-4 nn-'exce` ve amount ot' nir ndinitted, het itl tion end may' he considerably .variediv-ithout. 80

sprocketsnt the"inner en d 'and Consequently grate. ef

" is admitteda't a point where ittends 4to cheek del'inrting from thezspirit oftlie invention.' f

" tend to, Coo theQlinlsto preven-tnieltingand willmix u'ith'the-coalfgns'gradually to-promote combustion/ lVith thisendin'view provide, iii-st, abeille bet'nteent'he top and 'withdrawnbpdily fromt rendering the connectionbetn'een the hntlle .ifth. means L fo'r preventing .the passage of wallsfof the furnace.;

the passage 4o n ir at this pointand to ca use sage'oflnir beneath the rbetknner returning lixstrnted inthe accompanying draivings'iin embodying my invention.

--The grate properfis supportedzupon twof side frames 16, which, nearthe r'earjend have.. Aa vertical rib' 17 .adaptedjto malte-.contact with thewalls 15 vcloselyenough.to-'suhstam *'85 tially prevent the passige of air tirou'nd .l them.' .Oidinarilythe frame 1G will bepr`o vided with wheels 18-` 'adapted t0 f IQll'On l trneks. 19's@ that the'tvhole grate vnitty oe he stationary set-"98 it to' pass 'up'through the Agrate 'during the earlier st affesof.combustion -whe're it will end .the links practieallyj'eir.tight; second.

"l `he lin-ks Q0 are arti'eulatelv eonneete'd'hy' means onthe side of thelinlgs for preventing means of rods 21 'passing through apertures bottom 'of thegrate 'togethe1 \\ith means 't'or ting for repairs.

the 'passage ofjainlengthwise thi-nigh the portion oiA the links.A The links are a1-fv 95.."

ranged chsetogetlier. o n the rods to,oce.py v substantially the 4entire distance The-tween portion-'f the"gr ate Fourth.'A means; for 'theoppsing inner 'aces'o'fithes ide. rzmies preventingr the passagepf' nir b et'n'een the lili. This" peVQnS -hlfell 'Shifting 0f *h5 A' side" of the links and theside' frames, and elinks, and'also'prevent's the ,coal fro'n 'going 10Q to, waste bydropping over theedgesoithe' i" uit between the sidej'of-the' f iaine mid the 1i-:ite betwcen'the outside links andthe sidel trame's. The inside suriaceslof theside: f. I obtain my objects by the mechanism il- .frames are flush; that is, are plane s urfaees; l 1

.whiehziV Figure 1 isa .setioniil elevation of a grate Fig. Q vis a see In thisfivay thefram'es 'themselves hold the tional elevation ofthe .inner end'o the grate `links onthe rods without the aid of' Cotter audits surrpnndingportions ofthe structure, l

bends come close enough tothe sidera-mes to prevent the links romslippmg o of then-L thain grate itself'an'd the inoiintings'ther'.e'oJ

pins, nuts or any .of the other de v'iceseorni 110 monly employed fcr this purpose.' The preferred formofglink is best shown in Figs. and G where itswill be seentht the' a ertures 22 are Surrounded by bosses w ich Y5 are the. full width of the link at the-widest part. A web 2&1- connects the bosses with each other and with the head 25 which is also the full width of the link andis pro videdV with upwardly extending ducts or 1o channels 2.6 for 1permitting the rise .of air up through the lin for cooling the latter and for supplying the coal with the amount of air required for combustion. Extending upward from the bosses to the head are vertical bs 27 which are also the full width. When the links are assembled, obviously the boss, rib and head of one link will make close and continuous contact with the boss rib and head 'of the links on either side of it and 2'0 thus-will prevent air passing horizontally along between the links. But the ribs and bosses do not revent the passage of air ver tically upwar 'throughthe links. The grate itself is supported and travels around sprockets 30 supported upon axles 3l I. carried by the side frames 1G. Intermediate o fmthe s rockets the links are supported upon rol ers 32 which are rotatable about rods 33 carried by the side frames 16. 'Air is prevented from passing through the ends of tie grate. by means of a baille which nits preferred-form consists of a plate 35 `arranged substantially vertically' a slight distance forward of the rear sprockets, and fextending from one ofthe side frames to y the other. 'In its best form this plate does notl iake contact with the under edges ofthe upper links but terminates somewhat .xshort of them and carries a trough consist- 40 ing in the present instance oftwo diverging `;plates36 and 37 having horizontal flanges at .theirupper edges for stilening the plates and avoidin` the danger of the links catching upon t ern; The advantage in this trough like formation is that ashes collect .therein and form a yielding and constantly, .renewing seal which ellectually prevents' air from passing over the 'top of the baille. In `the present form a speeialseal is also pro vided between the baille and the forwardly -\moving links at the bottom of the grate. `This seal is shown in perspectivein 'Figa 3 and in operative position in Fig. lt. consists of a shoe 40, extending from one of the l side-frames 16 tothe-other and is adapted to slide-Lupen' the forwardly moving links; Said hoe is held in position by means of s'trap 41 which ride loosely over the stalona y`bar 42 and permit the shoe to rise n, fallend also rotate slightly, with any vennessfinfthe links. The shoes 1od beneat-h the stationary` late 35 and is l .Qsefly madepf considerub e width, meas- 'r i l fromfront torearl so as to extend over jwg of the-Eratelsuppoiting rollers, This construction results in a closure at two places, to wit,'at each of Said rollers because at each roller, the roliermakes contact on the bottom of thelinks and the shoe makes contact at the to and the side ribs 2T prevent "0 the passage ol) air atvany point between the bottom and top of the link.- Another ad vantage of the construction is that the shoe will catch and retain asuflicient quantity of ashes to form a seal-between the shoe and the lower edge of the plate. Reference to Figs. l. and 2 of the drawing will show that as soon'as the apparatus is in normal 'running order, ashes will collect at the top of the rbaille and thus form a seal which will prevent air from passing rearwardly past the baille. lf one link or set of links should scrape an unusual amount of ashes from vthe the trough 3G, 37 other ashes will-be imme. diately deposited and will refill the trough. The ashes noon the shoe 40 not only serve to stopl the gap between the plate. 35 .and the shoe but tend to protect both the' shoe and the plate from the heat of the burnin!T Air is prevented from passing horizontally 90 beneath the lower returning portion of thel grate by means of a cross wall 45 which. extends under two of the lowerv rollers 32 and coperates with said -rollers to form a receptacle for ashes to seal the space between the bottom of the grate and thefloor of the furnace. A

lVith the parts cooperating in the man ner above described it will be seen that air v is electually prevented from .passing, rb 100 yond or even gaining access to the rear.

'sprockets and consequently allv theair which does pass must. do so vertically throghthe' top of the grate and the. coalthereonthrou h the ducts or channels 26 provided for t e purpose. The'distribution of the air is therefore practically uniform over the portions of the grate where combustion is taking place and the result is that the air is introduced in the most advantageous place for combustion, the mixing ismorecomplete, and all excessive air is excluded from the flue. gases except such amount as is advantageous to combustion.

In the accompanying` drawings the air ducts 26 in the. sides of the heads 25 of -the links are shown to be oblique with Vre- ,spect to the length of the link.

I do not herein claim .a .link having this character-v istie-as it forms-the-subject"of.a'separate 120 application filed on thel 24th day of 'Dew cember, 1908, Serial No. 469,059. 1 .Having thus described my invention, what I claim as new andi desire. to Secure by' Letters Patent, is: f f 1 25 1. In a furnace, the combinationof 4aidiafiii grate wherein articulately connected 'links travel around sup orts at. the -front and rear,A a Cslstationary ba e .located near the inner en of the grate and a shoe located atiih zttom of the hsle and adapted to ride won the www; grate run, ,Suhl sho@ being impted to he npproxnmtely hoyzontally catching mng wit l. 11. In a furnace, the combination ot' u chain gmt-e wherein artculatey Connected .links :wei wound Supports at thm4 front und rez:

h the statiolmty lmlh am nir l@ @uhm-5 hehe-nth thelower grate run for sup-- t one'otlsad rollen@ being located putting the other, and wall located be- :Hund 0 and feminin# ashes, thelehv' to another thereof', ,vhui'c'by the rollers retain ashes; upon the wall folgsozlling the 15 space between the top of the wall and t1 e! lower gl'utu um.

In witnsfg whcleof. han; hmelmto Sub surihiad my nume h1 the presence of two Wit 1195503,

"ffitntfsgcs:

Gamm. f). DUNCAN, 'VmhLtM M. DUNCAN. 

